FIV and FeLV Testing for Kittens and Newly Adopted Cats

Yes, a kitten or a newly adopted cat can be tested for FIV and FeLV, two cat viruses that can weaken the body's defences. A small blood sample and a rapid kit give a first answer. Because a very young kitten or a very recent infection can mislead a kit, your vet may repeat the test later or confirm it with RT-PCR.

What are FIV and FeLV?

FIV stands for feline immunodeficiency virus. FeLV stands for feline leukaemia virus. "Feline" simply means "of cats".

A cat can look well for a long time after it picks up either virus. Many owners find out only when the cat keeps falling sick, or when a test is done on a new arrival. FIV passes mainly through deep bite wounds, so cats that roam and fight face more risk. FeLV spreads through close contact, such as grooming and shared bowls, and from a mother cat to her kittens.

Why test a kitten or a cat you have just adopted?

You rarely know the full past of a rescued kitten or a cat that walked in from the street. It may have lived with other cats, been in fights, or come from a litter whose mother was never checked. A test gives your vet a clearer starting point for its care.

It also protects the cats you already have. Testing before the newcomer meets them helps you and your vet decide how to introduce them.

What can a rapid kit show, and what can it miss?

The FIV / FeLV (Combo Kit) checks one small blood sample for both viruses at once. Inside, the kit looks for two different things. For FeLV it looks for a piece of the virus itself, called an antigen. For FIV it looks for antibodies, which are defence proteins the body makes after meeting the virus. If your vet wants only one virus checked, single kits exist too: the FeLV Antigen (Rapid Test) and the FIV Antibody (Rapid Test).

Each approach has limits. An antibody kit needs time for the body to make antibodies, so a cat infected very recently may still read negative. A negative result soon after a possible exposure therefore does not always rule infection out. A positive kit is a first answer, and your vet may confirm it with a second test before reaching a firm conclusion.

Why may a kitten need a repeat test?

A kitten gets some of its mother's antibodies through her first milk. If the mother had FIV, those borrowed antibodies can make an antibody kit read positive in a kitten that is not infected itself. They fade as the kitten grows, so the vet may ask you to bring the kitten back for another test when it is older.

FeLV can also change between tests. Some cats' bodies manage to control the virus, so a repeat after some time helps your vet see which way things are heading. The vet decides when to repeat, and it helps to keep every report so you can show them all.

When is RT-PCR used?

RT-PCR (real-time PCR) is a lab method that searches a sample for the virus's own genetic material, the set of instructions the virus carries. It does not depend on antibodies. Vets commonly ask for it when a kit result is unclear, for example in a young kitten or in a cat tested soon after possible exposure. There is a separate RT-PCR for each virus: the FeLV RT-PCR (Proviral DNA / RNA) and the FIV RT-PCR (Proviral DNA).

RT-PCR is more detailed than a kit, but it is not perfect either. A registered veterinarian reads it together with the kit result, the cat's signs and its history.

What happens after the result?

A positive result is not a reason to give up on a cat. It tells your vet to watch the cat's health closely, plan its care and advise you on living with other cats. A negative result tells you the test found nothing at that moment. It is not a promise for all time, because a new exposure can happen later.

Whatever the result, a cat that eats poorly, looks pale, keeps getting infections or seems weak should see a vet promptly. Do not wait for a test appointment, and do not give any medicine on your own.

Read next

If a cat looks pale or weak, Anaemia in Pets: Which Blood Tests Help Find the Cause explains how vets search for the reason with blood tests. To see why lab tests matter across a pet's life, read Benefits of Lab Tests for Dogs and Cats: How Vets Use Them.

Testing in Bhopal

Owners in Bhopal can ask for a blood sample to be collected at the door at no cost, so a new cat is not carried anywhere on its first week at home. The lab is at C-200, C Sector, Shahpura, and it confirms the method, sample needs and reporting time when you book. Call or WhatsApp +91 88175 01118. If you live in another district, the sample can reach the lab by courier or bus parcel, or your vet can send it.